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Finding the Fourth Proportional to 1,277.83, 1,915.37 and 912.43

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Solution

The fourth proportional to 1,277.83, 1,915.37 and 912.43 is: 1,367.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.83 : 1,915.37 = 912.43 : x
  2. Step 2: Convert to fraction form
    1,277.83/1,915.37 = 912.43/x
  3. Step 3: Cross multiply
    1,277.83x = 1,915.37 × 912.43
  4. Step 4: Simplify right side
    1,277.83x = 1,747,641.05
  5. Step 5: Solve for x
    x = 1,747,641.05/1,277.83
  6. Step 6: Final answer
    x = 1,367.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.